The invention discloses an active weft-feeding weaving mechanism of a carbon fiber braiding machine, and belongs to the technical field of textile machinery. The active weft-feeding weaving mechanism of the carbon fiber braiding machine comprises an active weft-feeding action execution unit, a driving unit and a dynamic weaving mouth protection unit; the active weft-feeding action execution unit comprises a swinging arm, a swinging shaft and a cloth guide shaft, the swinging arm is provided with two parts of which the left and right are symmetrical and are connected as a whole through the swinging shaft and the cloth guide shaft, and the two ends of the swinging shaft are mounted on a wall board of the carbon fiber braiding machine in a hinged assembly mode; the driving unit, the dynamic weaving mouth protection unit and the active weft-feeding action execution unit are assembled in a matched mode. According to the active weft-feeding weaving mechanism of the carbon fiber braiding machine, weft yarn is inserted in a weaving mouth through the forward movement of the carbon fiber braiding cloth weaving mouth, and the angle of a warp yarn weaving mouth is limited by the dynamic weaving mouth protection unit, and therefore the problem existing in a traditional beating-up mechanism is solved that the width of expanded carbon fiber tows gets narrower, and the purpose of improving quality of carbon fiber fabric products is achieved.